An appeals court in Mauritania overturned the convictions of three anti-slavery activists on Friday and reduced the sentences of 10 others for their alleged role in a riot in June, Amnesty International said, Reuters reported. A tribunal had sentenced the 13 members of the Initiative for the Resurgence of the Abolitionist Movement (IRA) in August to up to 15 years in prison after a protest against eviction by residents of a slum in the capital Nouakchott, many of whom are themselves former slaves. In addition to the three whose convictions were overturned, seven others are now to be released on time served, Amnesty said in a statement. "The release of three anti-slavery activists who had been unfairly sentenced to up to 15 years for peacefully expressing their opinions is a huge relief," said Kine Fatim Diop, Amnesty's West Africa campaigner.